The plant kingdom

The divisions of the plant kingdom can be divided into two categories.One category contains plants that do not have veins, nonvascular plants. The other category contains plants that do have veins , wich are called vascular plants. The term vascular means "vessels", such as the blood vessels that carry blood throughout your body.

In your body , blood vessels carry nutrients to places where they are needed to help you grow and stay alive. Vascular plants also have such vessels , wich sometimes called veins or tubes. These vessels carry water and dissolved nutrients to all parts of the plant to help the plant grow and stay alive.

The plants in the first division of the plant kongdom , the liverworts ,hornworts, and mosses do not have viens. How are water and nutrients delivered to all parts of these plants?

The water and nutrients( wish are dissolved in water) pass directly from outside of the plant into their cells , and from one cell to the next.This process works well over short distances but does not work well over long distances.This is one reason why plants such as mosses are very short .

If mosses were taller , like trees , the force of gravity would prevent water from moving from cell to cell to the top of the plants.